Science Inventory

HETEROGENOUS PHOTOREACTION OF FORMALDEHYDE WITH HYDROXYL RADICALS

Citation:

Driscoll, D. HETEROGENOUS PHOTOREACTION OF FORMALDEHYDE WITH HYDROXYL RADICALS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/085 (NTIS PB95227252).

Description:

Atmospheric heterogeneous photoreactions occur between formaldehyde and hydroxyl radicals to produce formic acid. hese photoreactions not only occur in clouds, but also in other tropospheric hydrometeors such as precipitation and dew droplets. xperiments were performed by irradiating Teflon tubes containing nanomole concentrations of formaldehyde and hydrogen peroxide. ollowing irradiation at a wavelength of 313 nanometers, the concentrations of formaldehyde and formate ion were analyzed using High Pressure Liquid Chromatography and Ion Chromatography. ata are presented to illustrate how nitrate and sulfate anions effect the photo-oxidation of formaldehyde in the aqueous-phase, as well as the effects of these anions on the formate ion which is a product of this photooxidation. ormic acid and its precursor formaldehyde are soluble in the aqueous phase of the atmosphere. owever, inhibition of the atmospheric photo-oxidation reactions of these compounds coupled with evaporation of the clouds or dew droplets can result in recycling the compounds from the liquid-phase back to the gas-phase of the atmosphere.

Record Details:

Record Type: DOCUMENT (REPORT)
Product Published Date: 05/24/2002
Record Last Revised: 12/10/2002
Record ID: 42235

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL EXPOSURE RESEARCH LABORATORY